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i Letters Patent No; 78,401', dana May 26,1868.-

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To lALL WHoM' 1r MAY concierne:A e

j lBeit known that LANSON P.`THAYER, of Syracuse, in the county of Onondaga, and State of NewYork',

have-invented a new an'duseful- Improvement in Machines' for Grinding the Cutters of Mowers and Harvesters ;l

und I dohcreby. declare thefollowing to be a full, clear, and .exact'description of thesame.

":lhe nature f myinventiom relates to vimprovements in portable machines for grinding the cutters of mowers and harvesters, similarto that patented by HfWhitall, May 14, 1867, and is for the purpose of rendering the same m'o're simple, cheap, `andeicctve.l The machine may be readily carried by the` hand intothe iield, and applied to the mowing-machine, to grind the cutters thereot`,iwi thout taking them out'of the machine.L

And it consists in an arrangement oi' the operative parts upon a bench, which serves at the same time as the supporting-frame of themachineand a scat for thc operator. i

It also consists in an arrangement of means whereby the centact'of the grinding-stone with the cutters is made yieldin fri It also consists in an arrangement of thefra'me which'supports the operative parts, in combinationwith the bench, whereby a firmand steady. support for the swinging-frame is obtained.

Italsoconsists in an arrangement of operative parts, hereinafterv described, whereby the operator may apply the power 'of both hands to operate-the stone. i v i It also consists inan arrangement of mechanism foradjnsting the 'swinging-frame on its axis, and for c n-A nectinganddisconnecting it to eitherl side ofthe supporting-frame.-

It also-consists in the arrangement, with an oscillating-freinent' a feeding-screw that forms the axial supportfof theframe.

It' also consists in the combinationof a feedingscrew with the sliding-frame, 'and-the grindngwheeh and i the operative mechanism, whereby it communicates'reciprocating and rotary motion to the same; and

. It also consists in the combinations and arrangements of the diterent parts, as will be more fully described on reference to the accompanying drawings, whereini Figure 1 represents a plan view ofmyimproved machine, with a part broken away; it also shows someof the c utters ofa mowing-machine lin red; and

Figure 2 represents a side elevation=ofthe same, with parts broken away. Similar lcttersrepresent corresponding parts fin'both the liguresl A represents a bench made'of Vwood, erjany other suitable material, and provided' with legs B, B1, and B2i C represents a metallic frame,provided with ears a a at eachend, by which `it isipivoted to the sleeves al'and a2, and which-constitutes the support for the operative parts'. The sleeve al is adjustable on the post B, and may be secured to it at `any desired point bythescrews by which the-ears of the frame C are pivoted to it, which pass through the sleeve'4 and sit againstthepost.- The said frame is provided with a vertical and horizontal extension; C1, which terminates in two curved branches'for formingthe bearings of a horizontal driving-shaft;

' 02. It is also provided .with another vertical-extension, C3. Both these citensions pass upward through slots in the bench, whereby a'iirmand steady support is ati'ordedlagainst any tendencyto alateral trembling or vibrati "ing action ofthe framo'C, by reason -ot' the action of the grindingstone due to being suspended from one side ofthe frame i Y ,The sleeve a? isfree to slide on the postl32,.which is provided with the adjustable rings b and b1, andthe spiral springt.l The ring b1 is designed toprcven't'the sleeve from slippingeif from thovpo'st, and 'must be set so low'thereon that, when the latter stands vupon the finger-bnr of a mowing-machine, the grinding-wheel will be low enough to rest on the edge of the cutters, and be raisedthereby slightly against the action of the spring b2,

the object of which is to produce an elastic and yielding pressureof thegrindin'g-wheel on the said cutters, which is found for 4various ro'asons'ito be the best; as, for instance, the cutter-bar may sometimes spring in ,c on' sequence vof the pressure of-the weight of the operator, or from the irregularity of such'pessuredueto.the swaying motion of'his body in operating-,the machine, and fromivarious other causes.

. "llhc, tension .of the spring b2 may be adjusted by the ring.b,which may be adjusted ou the shaft B?, and fixed at any desired point by a set-screw; whereby a uniform light or `heavyipressurc of the grinding-wheel on I the cutters may be obtained.` `D represents an oscillating-frame composed oi'two ,cross-bars d d and guide-rods -d d1, and' suspended centrally on the scpew-shaft represents a sliding-frame, which is caused to move hack and forth'on the' oscillating-frame D. by means of" a screw-thread ojn the shaft E working in a corresponding female thread in the hub f of the cross-ban Aoi' th'e sliding-frame Fl The 'said-frame supports the mandrel f2 ,ofthe grinding-wheel G." g represents adriving-wheel connccted'tothe sliding frame F by mveansoi' au annular I projection on the cross-bar taking intoan annular groove in the hub ,of the wheel, solas to cause the wheelto slide back and forth on the shaft with the frame F. VThe wheel gv is provided with a spline, which tzr-kes into a long groove in the shaft, whereby rotary motion is communicated to the wheel, and by it to the bevel-pinion on4 the mandrclof the grinding-stone. .A

H represents a sleeve provided with a thumbnut an internal screw-thread, and a swivel-joint at its upper end withia'bent rod, whichris connected to the horizontal bai-of the frame-C by a thumb-screw, he. 4 The lower end is connected to a screw-rod, h1, provided with an eye, which is slipped on to one ,of the guide=rods otytho oscillating-frame D. By screwing the sleeve in one direction or the' other, the frame D-may be oscillnted in either direction, and, by taking o'ut the thumbscrew 'ythe frame D may he turned'over a half revolution, so as to present the grinding-wheel on the other side of'the frame in the same relative position to it. y

On the end ot' the screw-sh`at`t E,ne:`xt to the post B1, abe'vel-wheel is fixed, which gears with a correspond.

ing wheel-on the vertical shaft I, which is supported at its lower end in a step in the frame C, and at its upper end passes'through the bottom vof the aforesaid branched upper Atermination oi' the frame C, and is providednn its upper end with a bevel-wheel, which gears'into another similar wheel onthe driving-shaft C2, arranged in a horizontal position transversely of the bench, and is provided at each ond with a hand-crank, in .a suitable position for the operators sitting on the bench', astride thereof, to take one vcrank in each 'hn-nd, wherebyhe is enabled to exert his full power thereon, which is a matter of great importance inl operating' machines of this character, for the work isrequired to'be done when time is of great value, which can be materially saved by this arrangement. I l V The red lines shown intig. 1 represent a portion qt' the cutters and fingers of a mowingmachine.

To use my improved machine, the operator, haringV first moved the cutter-bar in the mowing-machine, so

as to present oneedge of'allthecutters centrally between ,the ngers, as shown in iig. 1, places the foot of' the post B2 on the cutter-bar, and the legs B on the ground, taking, care that thesliding-frnme D stands on the Aline parallel with that kedge offth'c cutter whichv stands between the ngers and is' to be ground, and'that'tho lower central portion of thostoue is directly over the said edge of 'the cutters. Then, by means ofthe screwed sleeve H, he adjuststhe oscillating-frame on` the shaft E," so as to bring-the lower face of the grinding-stencil; un angular plane-to agree with the hevclled face of the edge of thccutter. If, then, the' ring b, on the post B3, be adjusted low enough to allow the spring. b2 to bear the' grinder on thesaid.` bevelled edge'of the cutter',

he sits down upon the seat A2, and, by his weight thereon, maintains the post Bi-rmly in its position on tho cutter-bar, while, with b'oth handsvapplied .to the cranks, he gives motion thereto and to the,` grinding-wheel, therotation of which, in contact with the edge ofthe cutter ati thesame time that it is beiiigreciprocated over the'said cutting-edge by the screw E, grinds thevsamo, as ,will be readily understood.

` When the stone'has traversed to theinn'er angle of the cutters, the` operator turns the cranks in tho other direct-ion, and thereby moves it back again to th'e'point, und repcatsthe operation until th'c--cutter is suicieutly o sharpened; after which,l rising from his seat, he moves the machine along tothe next cutter, and grinds it in the same manner, and continues the operation untilall the cutters are ground on that edge.. He then moves the cutter-bar, so as to presentthe other cutting-edges between the ngers in the same manner as before, when he raises the machine from the cutter-bar and disconnects ,the screw-sleeve H` from the-beam'y of ,the from@ C. by taking out the thumb-nut'hz, swings the oscillating-frame over,'.so as'to present the grinding-wheel-on the other sideof the bench, when4 he applies the machine to the mowing-machine in the samey manner asbeiore stated, taking care that ,the oscillating-frame stands in a line parallel with that edge ofthe zcutter, and that the grinder stands directly over the edge of the cutter; lthen,'ladjusting the oscillating-frame, so as to bring tho lower face ofv` the grinder tothe same angula'plane as that of the bevel of thez edgetof the cuttcr,'he is ready to'proceedto grind them on that. edge,`as before.

. Having thus fully-described my invention, Iwhat I claim, and desire to secure by Lett'ersPatent, is.-

1. A portable grinding-mechanism for .grinding thocutters of mowing-machines, provided-with a'hench forming a sent for the operator, substantially' as and for the -purpose desefrihedv 2. A mowing-machine grinding-wheel"provided with-means for -p'rcs'siug it upon the 'cutter-'blades with a yielding pressure, substantially as and forl thenpurpose described.

3. The combination otthe vertical ,extensions Chanda()3 ci' the frame Cir-ith the bench,substantially as' and for the purpose described.

4. ,The mechanism'oi a'portable cutter-gr g bination with driving-mechanism arranged forthe application of both hands of the operator t9 the rlifiving' s|mft substantially as and for the purpose described. l 1

5. The combination, witli'the frame 'C and theswingin'g-f'ralnc D, 0f thescrewed sleeve H provided with a swivel-joint, substantially as and forl the purpose described.

6. The combination of the' oscillntingjframel'.) with the feeding-screw E arranged within' the frame, and serving as the-axial support of the same, substantially/as and for the purpose described.

` 7. Therotating fceding-screw,i n combination with t e sliding-frame, grinding-wheel, nud its operative mechanism arranged with the screw, substantially asand for the purpose" described.

inding machine, constructed substantially as desaribcxhin co'm- 8. rihecombination of the frame C with the adjustable slernfesetl substantially as and for the purpose described.

9. The combination of the frame C with the sleeve a2,.post B2, prorided with the adjustable rings and Ill, substantially as and for the purpose described. 10. The combination, with the frame C, ofthe crankshaft C2 with the connecting-gear wheels, s

In testimony whereof, I have and a?, posts B* arid Biand the bench A,

spiral spring 211ml vertical shaft I, and screwlshaft E, provided ubstautially as and 'or the purpose described.

subscribed my name, this 30th day of March, 1868.

l A. P.- THAYER. Witnesses:

H. LOWENBERG,

W. D. KELLEMP. 

